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Index exceeds matrix dimensions. Error in rough (line 62) x1(r(1)+1,​r(2)+1)=xx​x(i,j);

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juveria fatima
juveria fatima 2018-3-27
am unable to shuffle back due to index problem please anyone help me out
clear all
clc
g=imread('cameraman.tif');
% g=double(g)/255;
subplot(231)
imshow(g)
original=g;
[m,n]=size(g);
mo=m;
num = 12;
K=10.^10;
% K=19;
%....................Shuffling.......................
disp('........................Started Shuffling.....................')
%Tinkerbell shuffling
a=0.3;b=0.6000;c=2.0;d=0.27;
for k= 1:num
for i=1:m
for j=1:n
r = mod([round(abs((i^2)-(j^2)+(a*i)+(b*j))),round(abs((2*i*j)+(c*i)+(d*j)))], [m,n]);
% r = mod([(i+j),(j+K*sin(((i+1)*n)/2*pi))],mo);
% r = [((i-1)+(K*sin(j-1))),((j-1)+i)];
% r = uint8(r);
ggg(i,j)=g(r(1)+1,r(2)+1);
% ggg(i,j)=g(r(1),r(2));
end
end
g=ggg;
end
subplot(232)
x=ggg;
imshow(ggg,[]);
title('Tinkerbell shuffled')
%henon Shuffling
[m,n]=size(x);
a = 1.4;b=0.3;
% num_iter=input('Enter the round for Arnold shuffling');
num_iter = 5;
% a=1.4;
% b=0.3;
for k=1:num_iter
for i=1:m
for j=1:m
r = mod([round(abs(1-(a*(i^2))+j)),round(abs(b*i))],[m n]);
xxx(i,j)=x(r(1)+1,r(2)+1);
end
end
x=xxx;
end
subplot(233)
imshow(xxx);
title('henon Shuffled Image')
save xxx x
disp('........................Shuffling process completed succesfully.....................')
%...................Inverse Shufling.............................
disp('........................Started Inverse Shuffling.....................')
%Henon Inverse Shuffling
for k=1:num_iter
for i=1:m
for j=1:n
r = mod([round(abs(1-(a*(i^2))+j)),round(abs(b*i))],[m n]);
x1(r(1)+1,r(2)+1)=xxx(i,j);
end
end
xxx=x1;
end
subplot(234)
imshow(x1);
title('henon Inverse Shuffled')
%Tinkerbell inverse shuffling
a=0.3;b=0.6000;c=2.0;d=0.27;
for k=1:num
for i=1:m
for j=1:n
r = mod([round(abs((i^2)-(j^2)+(a*i)+(b*j))),round(abs((2*i*j)+(c*i)+(d*j)))], [m,n]);
g1(r(1)+1,r(2)+1)=x1(i,j);
end
end
xxx=g1;
end
subplot(224)
imshow(g1)
title('Tinkerbell_inverse_shuffled')
disp('........................Inverse Shuffling process completed succesfully.....................')
psnr = psnr(g1,original)
ssim=ssim(g1,original)

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